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This is an old revision of this page, as edited by Finetooth (talk | contribs) at 21:54, 10 January 2012 (→‎Estimate: more numbers). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

WikiProject iconRivers Project‑class
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Thanks. — Headbomb {ταλκκοντριβς – WP Physics} 09:37, 15 March, 2009 (UTC)

How to calculate NHD stream lengths using ArcGIS Explorer

Copied from User talk:Finetooth

I finally figured this out with a little help from Esri:

  1. Download the summing add-in here.
  2. Download the file for the specific region you need from the list here (descriptions here). It may take a while.
  3. Open ArcGIS Explorer and click "Add Content", then "Geodatabase Data..." in the drop down menu.
  4. Add the geodatabase you downloaded by following the instructions (you only need NHDFlowline).
  5. Expand "Hydrography" which should appear on the left sidebar, then click "NHDFlowline".
  6. Under the "Tools" tab at the top, click "Query".
  7. Select "GNIS_Name - String" under "Fields", the equals button under "Operators", then type the name of the stream under "Value" and click "Use".
  8. Click "Test", then "OK".
  9. Make sure the new queried segment looks okay (no gaps or loops).
  10. Click the "Add-Ins" tab at the top, then "Column Statistics".
  11. From the drop down menu, select "LengthKM", and there you go! The total length is in the "Sum" row.

LittleMountain5 18:40, 17 October 2011 (UTC)[reply]


Green/Duwamish Rivers

Please comment on merging Green River (Washington) and Duwamish River at Talk:Green River (Washington). For those not familiar, The river changes name in the middle of its course for no reason in particular, so these are two rivers in name only. (Actually, there are historical reasons for the name change). D O N D E groovily Talk to me 19:27, 3 December 2011 (UTC)[reply]

RFC on coordinates in highway articles

There is currently a discussion taking place at WT:HWY regarding the potential use of coordinates in highway articles. Your input is welcomed. --Rschen7754 01:41, 26 December 2011 (UTC)[reply]

Geobox up for deletion

The Geobox template, which is used in all but one river GA with a box template, and in all river FAs (41 of 43 river FAs and GAs), is up for deletion. You may be interested in commenting for or against its deletion at Wikipedia:Templates_for_discussion/Log/2012_January_3#Template:Geobox. Thanks, Ruhrfisch ><>°° 05:06, 6 January 2012 (UTC)[reply]

Estimate

How many rivers are there in the world? emijrp (talk) 13:03, 10 January 2012 (UTC)[reply]

I think that must depend on how river is defined. What are the determining limits? Length? Discharge? Strahler number? The word "river" in its name? A table in Rivers of the United States: Volume II, Chemical and Physical Characteristics lists the number of "river channels of various sizes" in the United States (but not the whole world). The sizes correspond to the Strahler numbers, 1 for little ones averaging only 1.61 kilometres (1.00 mi) in length and 10 for the biggest one, the Mississippi, listed in the table at 2,896.82 kilometres (1,800.00 mi). The Mississippi is the only 10 in the United States, but there are 1,570,000 of the little ones. I can tell you what the total is for the United States, according to this source, if you can tell me which Strahler numbers are of interest. Finetooth (talk) 18:18, 10 January 2012 (UTC)[reply]
If you can tell me all Strahler numbers, it would be great. Thanks. emijrp (talk) 19:48, 10 January 2012 (UTC)[reply]
Order 1 = 1,570,000; Order 2 = 350,000; Order 3 = 80,000; Order 4 = 18,000; Order 5 = 4,200; Order 6 = 950; Order 7 = 200; Order 8 = 41; Order 9 = 8; Order 10 = 1. Bibliographic details about the edition of the book I'm quoting are here. The table is on page 17, and it is sourced to Fluvial Processes in Geomorphology by Leopold, Wolman, and Miller (1964), published by W.H. Freeman and Company. Hope this helps. Finetooth (talk) 21:54, 10 January 2012 (UTC)[reply]